Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.memsci.2004.10.021
Title: Effect of temperature on intrinsic permeation properties of 6FDA-Durene/1,3-phenylenediamine (mPDA) copolyimide and fabrication of its hollow fiber membranes for CO2/CH4 separation
Authors: Qin, J.-J.
Chung, T.-S. 
Cao, C.
Vora, R.H.
Keywords: CO 2/CH4 separation
Fluoropolyimide membranes
Hollow fiber spinning
Morphology
Shear rate effect
Issue Date: 15-Mar-2005
Citation: Qin, J.-J., Chung, T.-S., Cao, C., Vora, R.H. (2005-03-15). Effect of temperature on intrinsic permeation properties of 6FDA-Durene/1,3-phenylenediamine (mPDA) copolyimide and fabrication of its hollow fiber membranes for CO2/CH4 separation. Journal of Membrane Science 250 (1-2) : 95-103. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2004.10.021
Abstract: We have determined the effect of temperature on intrinsic permeation properties of 6FDA-Durene/1,3-phenylenediamine (mPDA) 50/50 copolyimide dense film and fabricated high performance hollow fiber membranes of the copolyimide for CO2/CH4 separation. The hollow fiber membranes were wet-spun from a tertiary solution containing 6FDA-Durene/mPDA (PI), N-methyl-pyrrolidone (NMP) and tetrahydrofuran (THF) with a weight ratio of 20:50:30 at different shear rates within the spinneret. We observed the following facts: (1) the CO2/CH4 selectivity of the copolyimide dense film decreased significantly with an increase in temperature; (2) the performance of as-spun fibers was obviously influenced by the shear rate during spinning. For uncoated fibers, permeances of CH4 and CO 2 decreased with increasing shear rate, while selectivity of CO 2/CH4 sharply increased with shear rate until the shear rate reached 2169 s-1 and then the selectivity leveled off; (3) After silicone rubber coating, permeances of CH4 and CO2 decreased, the selectivity of CO2/CH4 was recovered to the inherent selectivity of its dense film. Both the permeances and selectivity with increasing shear rate followed their same trends as that before the coating; (4) there was an optimal shear rate at which a defect-free fiber with a selectivity of CO2/CH4 at 42.9 and permeance of CO 2 at 53.3 GPU could be obtained after the coating; and (5) the pressure durability of the resultant hollow fiber membranes could reach 1000 psia at room temperature. © 2004 Elsevier B.V. All rights reserved.
Source Title: Journal of Membrane Science
URI: http://scholarbank.nus.edu.sg/handle/10635/88797
ISSN: 03767388
DOI: 10.1016/j.memsci.2004.10.021
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